* {
    padding: 0;
    margin: 0;
    text-decoration: none;
    list-style: none;
}

.lunbo>.picbox {
    width: 400px;
    height: 140px;
    margin: 0 auto;
    border: 2px solid black;
    position: relative;
}

.lunbo>.picbox>.imgbox {
    width: 100%;
    height: 100%;
}

.lunbo>.picbox>.imgbox>.pic {
    width: 100%;
    height: 100%;
    display: none;
}

.lunbo>.picbox>.imgbox>.block {
    display: block;
}

.block {
    display: block;
}

.icon {
    position: absolute;
    top: 40%;
    width: 20px;
    height: 20px;
}

.left {
    left: 0;
}

.right {
    right: 0;
}

.icon>img {
    width: 100%;
    height: 100%;
}


/* 实心圆 */

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 1px solid rgb(221, 215, 215);
    background-color: coral;
}

.button {
    width: 100px;
    margin: 5px auto;
    display: flex;
    justify-content: space-between;
}